noun 1. a person who makes preparations to survive a widespread catastrophe, as an atomic war or anarchy, especially by storing food and weapons in a safe place. noun 1. (US) a person who believes in ensuring his personal survival of a catastrophic event by arming himself and often by living in the wild (as […]

noun 1. Military. a package containing medical supplies, rations, and other vital equipment for use by a person forced to land in or parachute into the ocean, jungle, or other isolated or hostile territory. 2. a similar emergency kit for campers, hikers, etc. noun a collection of emergency supplies and equipment, including food, medical supplies, […]

noun 1. (not in technical use) natural selection. 2. a 19th-century concept of human society, inspired by the principle of natural selection, postulating that those who are eliminated in the struggle for existence are the unfit. survival of the fittest noun 1. a popular term for natural selection survival of the fittest Those best adapted […]

noun 1. the utility of a behavioral trait or of a physical feature of an organism in aiding the survival and reproduction of the organism.

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